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                                <html><head></head><body><div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><ul><li><span class="title-icon "></span><a href="#54-&#x4F7F;&#x7528;stbimage&#x89E3;&#x6790;&#x56FE;&#x7247;"><b></b>5.4 &#x4F7F;&#x7528;stb_image&#x89E3;&#x6790;&#x56FE;&#x7247;</a></li><ul><li><span class="title-icon "></span><a href="#1-&#x5F00;&#x6E90;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;"><b></b>1. &#x5F00;&#x6E90;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;</a></li><li><span class="title-icon "></span><a href="#2-&#x5BFC;&#x5165;stb&#x5E93;"><b></b>2. &#x5BFC;&#x5165;stb&#x5E93;</a></li><li><span class="title-icon "></span><a href="#3-&#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x5E76;&#x89E3;&#x6790;"><b></b>3. &#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x5E76;&#x89E3;&#x6790;</a></li><li><span class="title-icon "></span><a href="#4-&#x89E3;&#x6790;&#x7ED3;&#x679C;&#x9A8C;&#x8BC1;"><b></b>4. &#x89E3;&#x6790;&#x7ED3;&#x679C;&#x9A8C;&#x8BC1;</a></li></ul></ul></ul></div><h2 id="54-&#x4F7F;&#x7528;stbimage&#x89E3;&#x6790;&#x56FE;&#x7247;"><a name="54-&#x4F7F;&#x7528;stbimage&#x89E3;&#x6790;&#x56FE;&#x7247;" class="anchor-navigation-ex-anchor" href="#54-&#x4F7F;&#x7528;stbimage&#x89E3;&#x6790;&#x56FE;&#x7247;"><i class="fa fa-link" aria-hidden="true"></i></a>5.4 &#x4F7F;&#x7528;stb_image&#x89E3;&#x6790;&#x56FE;&#x7247;</h2>
<pre><code>CLion&#x9879;&#x76EE;&#x6587;&#x4EF6;&#x4F4D;&#x4E8E; samples\texture\load_image
</code></pre><p>&#x524D;&#x9762;&#x4ECB;&#x7ECD;&#x4E86;<code>.png</code>&#x3001;<code>.jpg</code>&#x56FE;&#x7247;&#x6587;&#x4EF6;&#x60F3;&#x8981;&#x7528;&#x4E8E;&#x6E32;&#x67D3;&#xFF0C;&#x9996;&#x5148;&#x5F97;&#x52A0;&#x8F7D;&#x5230;&#x5185;&#x5B58;&#xFF0C;&#x7136;&#x540E;&#x89E3;&#x538B;&#x5F97;&#x5230;RGB&#x6570;&#x636E;&#xFF0C;&#x7136;&#x540E;&#x624D;&#x80FD;&#x5C06;RGB&#x6570;&#x636E;&#x4E0A;&#x4F20;&#x5230;GPU&#x7528;&#x4E8E;&#x6E32;&#x67D3;&#x3002;</p>
<p>&#x8FD9;&#x4E00;&#x8282;&#x6765;&#x5B9E;&#x73B0;&#x56FE;&#x7247;&#x6587;&#x4EF6;&#x52A0;&#x8F7D;&#x4E0E;&#x89E3;&#x538B;&#x3002;</p>
<h3 id="1-&#x5F00;&#x6E90;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;"><a name="1-&#x5F00;&#x6E90;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;" class="anchor-navigation-ex-anchor" href="#1-&#x5F00;&#x6E90;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;"><i class="fa fa-link" aria-hidden="true"></i></a>1. &#x5F00;&#x6E90;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;</h3>
<p>&#x76EE;&#x524D;&#x5404;&#x5927;&#x6E38;&#x620F;&#x5F15;&#x64CE;&#x5E38;&#x7528;&#x7684;&#x56FE;&#x7247;&#x89E3;&#x6790;&#x5E93;&#x662F; <code>FreeImage</code>&#xFF0C;&#x652F;&#x6301;&#x51E0;&#x4E4E;&#x6240;&#x6709;&#x7684;&#x56FE;&#x7247;&#x683C;&#x5F0F;&#xFF0C;&#x5B98;&#x7F51;&#x5730;&#x5740;&#xFF1A;</p>
<pre><code>https://freeimage.sourceforge.io/index.html
</code></pre><p>&#x652F;&#x6301;&#x56FE;&#x7247;&#x683C;&#x5F0F;&#x591A;&#xFF0C;&#x610F;&#x5473;&#x7740;&#x4EE3;&#x7801;&#x91CF;&#x5927;&#xFF0C;&#x6211;&#x4EEC;&#x6682;&#x65F6;&#x53EA;&#x9700;&#x8981;&#x52A0;&#x8F7D; <code>.png</code>&#x3001;<code>.jpg</code>&#xFF0C;&#x627E;&#x4E2A;&#x8F7B;&#x91CF;&#x7684;&#x5E93;&#x5C31;&#x53EF;&#x4EE5;&#x4E86;&#x3002;
&#x4E00;&#x4E2A;&#x7EDD;&#x4F73;&#x7684;&#x9009;&#x62E9;&#x5C31;&#x662F; <code>stb_image</code>&#x3002;</p>
<pre><code>std&#x662F;&#x4E00;&#x4E2A;&#x5355;&#x5934;&#x6587;&#x4EF6;&#x5F00;&#x6E90;&#x5E93;&#xFF0C;&#x6BCF;&#x4E2A;&#x5934;&#x6587;&#x4EF6;&#x5B9E;&#x73B0;&#x4E00;&#x79CD;&#x529F;&#x80FD;&#xFF0C;&#x5B98;&#x7F51;&#xFF1A;https://github.com/nothings/stb
</code></pre><h3 id="2-&#x5BFC;&#x5165;stb&#x5E93;"><a name="2-&#x5BFC;&#x5165;stb&#x5E93;" class="anchor-navigation-ex-anchor" href="#2-&#x5BFC;&#x5165;stb&#x5E93;"><i class="fa fa-link" aria-hidden="true"></i></a>2. &#x5BFC;&#x5165;stb&#x5E93;</h3>
<p>&#x4E0B;&#x8F7D;<code>stb</code>&#x6E90;&#x4EE3;&#x7801;&#xFF0C;&#x653E;&#x5230;&#x9879;&#x76EE;&#x7684;<code>depends</code>&#x76EE;&#x5F55;&#x4E0B;&#x3002;
<a href="../../imgs/texture_make_beautiful/load_image/stb_depends_src_dir.jpg" data-lightbox="612bdb52-74c7-4c28-a9c6-ee10f2adbc85" data-title=""><img src="../../imgs/texture_make_beautiful/load_image/stb_depends_src_dir.jpg" alt=""></a></p>
<p>&#x8FD9;&#x6837;&#x5C31;&#x53EF;&#x4EE5;&#x5728;&#x9879;&#x76EE;&#x4E2D;&#x4F7F;&#x7528;&#x4E86;&#x3002;</p>
<h3 id="3-&#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x5E76;&#x89E3;&#x6790;"><a name="3-&#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x5E76;&#x89E3;&#x6790;" class="anchor-navigation-ex-anchor" href="#3-&#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x5E76;&#x89E3;&#x6790;"><i class="fa fa-link" aria-hidden="true"></i></a>3. &#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x5E76;&#x89E3;&#x6790;</h3>
<p>&#x521B;&#x5EFA;&#x7C7B;<code>Texture2D</code>&#xFF0C;&#x7BA1;&#x7406;&#x56FE;&#x7247;&#x76F8;&#x5173;&#x63A5;&#x53E3;&#x3002;</p>
<p>&#x5728;&#x4F7F;&#x7528; <code>stb_image</code> &#x89E3;&#x6790;&#x56FE;&#x7247;&#x6587;&#x4EF6;&#x4E4B;&#x524D;&#xFF0C;&#x5148;&#x6DFB;&#x52A0;&#x76F8;&#x5173;&#x5B8F;&#x5B9A;&#x4E49;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> STB_IMAGE_IMPLEMENTATION</span>
</code></pre>
<p>&#x518D;&#x5BFC;&#x5165;&#x5934;&#x6587;&#x4EF6;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-string">&quot;stb/stb_image.h&quot;</span></span>
</code></pre>
<p>&#x7136;&#x540E;&#x7F16;&#x5199;&#x63A5;&#x53E3;&#x4EE3;&#x7801;&#xFF0C;&#x52A0;&#x8F7D;&#x56FE;&#x7247;&#x6587;&#x4EF6;:</p>
<pre><code class="lang-c++">Texture2D* Texture2D::LoadFromFile(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; image_file_path)
{
    Texture2D* texture2d=<span class="hljs-keyword">new</span> Texture2D();

    stbi_set_flip_vertically_on_load(<span class="hljs-literal">true</span>);<span class="hljs-comment">//&#x7FFB;&#x8F6C;&#x56FE;&#x7247;&#xFF0C;&#x89E3;&#x6790;&#x51FA;&#x6765;&#x7684;&#x56FE;&#x7247;&#x6570;&#x636E;&#x4ECE;&#x5DE6;&#x4E0B;&#x89D2;&#x5F00;&#x59CB;&#xFF0C;&#x8FD9;&#x662F;&#x56E0;&#x4E3A;OpenGL&#x7684;&#x7EB9;&#x7406;&#x5750;&#x6807;&#x8D77;&#x59CB;&#x70B9;&#x4E3A;&#x5DE6;&#x4E0B;&#x89D2;&#x3002;</span>
    <span class="hljs-keyword">int</span> channels_in_file;<span class="hljs-comment">//&#x901A;&#x9053;&#x6570;</span>
    <span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">char</span>* data = stbi_load(image_file_path.c_str(), &amp;(texture2d-&gt;width_), &amp;(texture2d-&gt;height_), &amp;channels_in_file, <span class="hljs-number">0</span>);
    <span class="hljs-keyword">if</span> (data!= <span class="hljs-literal">nullptr</span>)
    {
        <span class="hljs-comment">//&#x6839;&#x636E;&#x989C;&#x8272;&#x901A;&#x9053;&#x6570;&#xFF0C;&#x5224;&#x65AD;&#x989C;&#x8272;&#x683C;&#x5F0F;&#x3002;</span>
        <span class="hljs-keyword">switch</span> (channels_in_file) {
            <span class="hljs-keyword">case</span> <span class="hljs-number">1</span>:
            {
                texture2d-&gt;gl_texture_format_ = GL_ALPHA;
                <span class="hljs-keyword">break</span>;
            }
            <span class="hljs-keyword">case</span> <span class="hljs-number">3</span>:
            {
                texture2d-&gt;gl_texture_format_ = GL_RGB;
                <span class="hljs-keyword">break</span>;
            }
            <span class="hljs-keyword">case</span> <span class="hljs-number">4</span>:
            {
                texture2d-&gt;gl_texture_format_ = GL_RGBA;
                <span class="hljs-keyword">break</span>;
            }
        }
    }

    <span class="hljs-comment">//&#x91CA;&#x653E;&#x56FE;&#x7247;&#x6587;&#x4EF6;&#x5185;&#x5B58;</span>
    stbi_image_free(data);

    <span class="hljs-keyword">return</span> texture2d;
}
</code></pre>
<p>&#x7136;&#x540E;&#x5728;<code>main.cpp</code> &#x4E2D;&#x8C03;&#x7528;&#x63A5;&#x53E3;&#x3002;</p>
<pre><code class="lang-c++"><span class="hljs-comment">//&#x521B;&#x5EFA;Texture</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">CreateTexture</span><span class="hljs-params">(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span> image_file_path)</span>
</span>{
    Texture2D* texture2d=Texture2D::LoadFromFile(image_file_path);
}

<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span>
</span>{
    init_opengl();

    CreateTexture(<span class="hljs-string">&quot;../data/images/red.png&quot;</span>);

    compile_shader();

    ......
}
</code></pre>
<h3 id="4-&#x89E3;&#x6790;&#x7ED3;&#x679C;&#x9A8C;&#x8BC1;"><a name="4-&#x89E3;&#x6790;&#x7ED3;&#x679C;&#x9A8C;&#x8BC1;" class="anchor-navigation-ex-anchor" href="#4-&#x89E3;&#x6790;&#x7ED3;&#x679C;&#x9A8C;&#x8BC1;"><i class="fa fa-link" aria-hidden="true"></i></a>4. &#x89E3;&#x6790;&#x7ED3;&#x679C;&#x9A8C;&#x8BC1;</h3>
<p>&#x8C03;&#x7528;<code>stbi_load</code>&#x89E3;&#x6790;&#x56FE;&#x7247;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x8FD4;&#x56DE;&#x56FE;&#x50CF;RGB&#x6570;&#x636E;(data)&#x3001;&#x5BBD;&#x3001;&#x9AD8;&#x3001;&#x901A;&#x9053;&#x6570;&#x3002;</p>
<p>&#x67E5;&#x770B;data&#x5185;&#x5B58;&#xFF0C;&#x5982;&#x4E0B;&#x56FE;&#xFF1A;
<a href="../../imgs/texture_make_beautiful/load_image/load_png_success_view_data.jpg" data-lightbox="46b73109-3fe9-44d2-834c-a6e6c2c4f831" data-title=""><img src="../../imgs/texture_make_beautiful/load_image/load_png_success_view_data.jpg" alt=""></a></p>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x90FD;&#x662F;&#x91CD;&#x590D;&#x7684; <code>ed 1c 24 ff</code>&#xFF0C;&#x8F6C;&#x6362;&#x5230;&#x5341;&#x8FDB;&#x5236;&#x5C31;&#x662F;<code>237 28 36 255</code>&#xFF0C;&#x8FD9;&#x6B63;&#x662F;&#x4E0A;&#x4E00;&#x8282;&#x521B;&#x5EFA;&#x7684;&#x7EA2;&#x8272;&#x56FE;&#x7247;&#x7684;&#x50CF;&#x7D20;&#x989C;&#x8272;&#x503C;&#x3002;</p>
<p><a href="../../imgs/texture_make_beautiful/texture_format/color_rgb_value.png" data-lightbox="1132794b-49ec-4da3-91f1-64f78596312c" data-title=""><img src="../../imgs/texture_make_beautiful/texture_format/color_rgb_value.png" alt=""></a></p>
<p>&#x8FD9;&#x8BF4;&#x660E;&#x5DF2;&#x7ECF;&#x6210;&#x529F;&#x89E3;&#x6790;&#x4E86;<code>.png</code>&#x683C;&#x5F0F;&#x56FE;&#x7247;&#xFF0C;&#x83B7;&#x53D6;&#x5230;&#x4E86;&#x539F;&#x59CB;&#x7684;RGB&#x6570;&#x636E;&#xFF0C;&#x4E0B;&#x4E00;&#x6B65;&#x5C31;&#x53EF;&#x4EE5;&#x4E0A;&#x4F20;&#x5230;GPU&#x4E2D;&#x8FDB;&#x884C;&#x6E32;&#x67D3;&#x3002; </p>
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